According to the report, the LeRoy Butler Foundation hasn't filed with the IRS since 2002, and Butler had his tax-exempt status revoked in recent years for failing to file returns, even though he continued raising money under that name through this year.

A scholarship fund founded in 2009 had its tax-exempt status revoked after failing to file returns by 2012. The only return on file from Butler since 2002 is a short-form 2011 filing for the fund, according to the report.

Butler, 45, played for the Packers from 1990 to 2001 and made four Pro Bowls.

Butler made a statement on social media to the report of the IRS investigation.

"Prior to the publication of that article, my Foundation had been cooperating with the Internal Revenue Service in their review of the Foundation,” the Facebook post read in part. “Concurrently, the Foundation was conducting an independent review to determine if it was operating in compliance with federal guidelines.”